Rotary furnace.



N0. 779,119 PATENTED JAN. 3, 1905.

H. DAVEY. l

ROTARY FURNAGE.

APPLICATION FILED rms. 9. 1904.

W/TNESASESZ t gZU/ A770 EY Patented January 3, 1905.

PATENT (Druten,

HUGH C. DAVEY, OF SAN JOSE, CALIFORNIA.

` `ROTARY FURNACE.

SPECIFICATION forming part of Letters Patent No, 77 9,119, dated January 3, 1905.

Application filed February 9, 1904. Serial No. 192,810.

T0 @ZZ whom it muy concern.'

Be it known that LHUGH C. DAVEY, acitizen of the United States, residing at San Jose, in the county of Santa Clara and State of California, haveinvented new and useful Improvements in Rotary Furnaces, of which the following is a specification.

My invention relates to improvements in roasting-furnaces of that class in which a horizontal or slightly -inclined cylinder is revolved upon its axisand the heat of the furnace is applied, the ore being caused to pass gradually from one end to the other.

My invention consists in the combination of a plurality of revoluble inclined barrels, each having stationary heads and furnaces connecting therewith, through which heat is delivered to pass through the barrels. These barrels are set with relation to each other and provided with intermediate automatic discharge-chutes from the end of one cylinder and receivers into which the ore passes and by which it is delivered to the succeeding cylinder. y

My invention also comprises details of construction, which will be more fully explained by reference to the accompanying drawings, in which- Figure lis a longitudinal section of one cylinder and connections. Fig. 2 is an end view of same with connections and partial section of following cylinder.

As shown in the drawings, A is a suitable bed or framework, having mounted upon it the journaled bearing-rollers 2, which are fixed upon shafts journaled at each side of the center of the frame. Upon these rollers the cylinder 3 is mounted, this cylinder having a surrounding band or track, as at 4',corresponding with each pair of rollers 2, so that as it rests upon these rollers it will also be revolved by their revolution. At the receiving end of the cylinder is formed an outwardly-tapering conical head, as at 5, which is fixed to and revoluble with the cylinder. The cone-shaped projection is of some smaller diameter than the interior of the cylinder, and the latter is suitably lined with fire-brick or an equivalent heat resistant. The projecting cone at the head of each cylinder extends through brick or masonry work, within which it fits sufficiently closely, and the ore to be roasted is fed into this end from a suitable chute or source of supply. At the opposite end the cylinder has a section of larger diameter, as at 6, and the iiange 7 at the end of this section is revoluble within acircular channel, as at 8, formed in the head 9. This head is stationary and suitably mounted and has at the lower part an inclined chute, as at 10, so that as the ore travels gradually from one end of the cylinder to the other by reason of its inclination, or by the assistance of spirally-disposed ribs if it is desired to use such devices, the kore will pass into the head 9, thence out through the chute 10. This chute discharges into a hopper or receiver, as at 11, and from the bottom of this receiver a chute 1Q extends into the conical head or cap 5 o'f the succeeding roasting-cylinder.

Each succeeding cylinder is mounted similarly tothe one previously described, at any desired relation therewith and sufficiently lower than the preceding one, so that the ore may be automatically delivered from one cylinder to the next succeeding one.

13 represents a furnace or fireplace, of which one is located at the discharge end of each of the cylinders, and the furnaces have open communication with the stationary heads 9,' so that when the fire is made the products of combustion are delivered from the furnace through the head into the enlargement 6 and thence pass through the body of the furnace, the revolution of which causes the ore to be continually turned and fresh portions brought into contact with the hot products passing through the cylinder. In this manner the ore is gradually roasted, passing through as many connected furnaces as may be found desirable to complete the operation.

As the cylinders usually have their axes inclined in the direction'of their length, it is necessary to provide some means for preventing the cylinders from moving lengthwise during their revolutions. I have here shown such a means in the form of bevel-faced annular rings 15, carried by the cylinders and contacting with corresponding beveled wheels or pulleys l5/, turning upon iiXed axes and serving as thrust-bearings.

This furnace is especially designed for desulfurizing ore-such as, for eXample,ores containing quicksilver or other valuable metals.

Furnaces of comparatively small capacity are usually employed, because if long chambers are used with single fires too intense a heat must be applied at -the fireplace end in order to be effective through the whole furnace, and this melts and slags the ore, so that it will not pass freely.

This invention is designed to use independent furnaces of comparatively short length with separate fires, each serving to heat its own cylinder, and the partially-roasted ore may be successively delivered in a heated condition to the following' cylinder and subjected therein to comparatively low heat, which while being suflicient to roast the ore and expel the sulfur will not cause it to melt or slag. These separate furnaces may be mounted in any suitable or convenient relation with each other and may be connected with independent chimneys or escape-flues.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. An improved ore-roasting apparatus havingin combination aplurality of inclined revoluble cylinders, each having a conical .receiving end forming substantially a close joint through the masonry in which it is turnable, an enlarged head rigid with the discharge end of the revoluble cylinder said head having an outwardly-extending annular flange, a stationary head abutting the head of the cylinder and having an annular channel interior to one end to receive said liange, a furnace proximate to the stationary head and delivering the products of combustion thereinto and into the cylinder, said stationary head having a deliverychute, and an open uninclosed receiver in communication with the said`chute and interposed between the same and the conical inlet of the succeeding cylinder.

2. An improved ore-roasting apparatus having in combination a plurality of inclined revoluble cylinders each having a conical receiving end forming substantially a close joint through the masonry in which it is turnable, an enlarged head fixed to the discharge end of the cylinder, open at both ends and having a projecting flange surrounding the outer end, a stationary head abutting the outer end of the Erst-named head and open at both ends, and having an annular channel around the interior of the inner end to receive said surrounding flange, said stationary head having a chute extension at its lower end, a furnace communicating with the opening in the outer end of the stationary head and delivering the products of combustion thereto and to the ore, an open uninclosed receiver between the chute of the stationary head and conical inlet of the succeeding cylinder, and thrust-bearings to maintain the joint between the conical inlet and the masonry said bearings consisting of annular beveled rings on the cylinder and corresponding beveled pinions journaled at right angles with the cylinder-axis.

In testimony whereof l have hereunto set my hand in presence of two subscribing witnesses.

HUGH C. DAVEY.

Witnesses:

S. H. NoURsE, Jnssm C. BRODIE. 

